Subaru 2009 IMPREZA Service Manual page 1219

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D: ADJUSTMENT

Clean spark plugs with a nylon brush, etc. Clean

and remove the carbon or oxide deposits. If depos-

its are too stubborn, replace the spark plugs. After

cleaning the spark plugs, measure the spark plug

gap using a gap gauge.

• Never use a plug cleaner.

• Never use a metal brush because it makes insu-

Spark plug gap L:

0.7 — 0.8 mm (0.028 — 0.031 in)

IG(H4DOTC)-6